From time to time, the prices of frequently used domain names drop to as low as 3-6 dollars. Today, prices seem to be skyrocketing everywhere. Is there any method behind this fluctuation? Let's say I require a hundred domains. Even a two-dollar discount would be beneficial. Is there a wholesale rate available somewhere?

This website provides a list of reduced-price domain names:
https://www.domainnameapi.com/domain-promos

If you're looking for an affordable and catchy domain name, it's worth checking out this site for available promotions. However, make sure that the domain name you select is relevant to your brand or business and easy to remember.

I believe that there is no set system for domain name prices. With numerous registrars and infinite resellers present, sales can occur whenever they want.

That said, it would be wise to conduct a quick Google search for existing promotions before purchasing a bundle of domain names at once. This could help you identify any suitable offers available at the particular time.

The prices of domain names can fluctuate due to various factors, including market demand, registry fees, and registrar pricing strategies. Here are some possible reasons why prices may seem to be skyrocketing:

Registry fee increases: The Internet Corporation for Assigned Names and Numbers (ICANN) sets the registry fees for top-level domains (TLDs) such as.com,.net, and.org. These fees are typically passed on to registrars, who then pass them on to customers. If ICANN increases the registry fees, registrars may raise their prices to maintain their profit margins.
Registrar pricing strategies: Registrars may adjust their pricing strategies to maximize profits. For example, they may offer discounts for bulk registrations or long-term commitments, but increase prices for single-year registrations or renewals.

Market demand: The demand for domain names can drive up prices. If many people want to register a particular TLD or domain name, registrars may raise their prices to take advantage of the demand.
Promotions and discounts: Registrars may offer promotions and discounts to attract new customers or retain existing ones. These promotions can create fluctuations in prices, making it seem like prices are skyrocketing when they're actually just returning to normal after a promotional period.
As for wholesale rates, some registrars offer bulk discounts for large orders. These discounts can vary depending on the registrar and the TLDs involved. Here are a few options to consider:

Bulk registration discounts: Some registrars offer discounts for bulk registrations, such as 10-20% off for 10-50 domains, or 30-40% off for 100-500 domains.
Reseller programs: Some registrars offer reseller programs that allow you to buy domains at wholesale rates and resell them to your customers. These programs often require a minimum commitment or a setup fee.
Domain brokers: Domain brokers specialize in buying and selling domains in bulk. They may offer better prices than registrars, but be sure to research their reputation and fees before working with them.
To get the best deals, I recommend:

Comparing prices: Research different registrars and compare their prices for the TLDs and domains you need.
Looking for promotions: Keep an eye on registrar promotions and discounts, which can offer significant savings.
Negotiating with registrars: If you're planning to register a large number of domains, contact the registrar's sales team to see if they can offer a better deal.
Considering alternative TLDs: If you're flexible about the TLDs you use, consider alternative options that may be cheaper.
For your specific requirement of 100 domains, I recommend contacting registrars directly to inquire about bulk discounts or wholesale rates. Some popular registrars that offer bulk discounts include:

GoDaddy: Offers bulk discounts for 10-500 domains
Namecheap: Offers bulk discounts for 10-100 domains
Google Domains: Offers bulk discounts for 10-100 domains
Keep in mind that prices and discounts can vary depending on the registrar and the TLDs involved. Be sure to research and compare prices before making a purchase.