i need a 775 motherboard that is not expensive

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Titan
Moderator
If you buy used, you get what you get.

If you want to buy new, companies still stocking those are often holding them for people and companies that need to keep legacy systems running and charge a premium for them. As you can see from those listed on partspicker, most LGA775 motherboards still listed with a price are around the $100 mark. You can get some Skylake H170 motherboards for about the same price.

Sinking money in an obsolete platform is often not worth it.