How much should you pay for a basic website to sell products?

it started at 200-300 now its 400-500 its very basic and on top of that I have to buy the domain. help?
Update: This site is purely to sell my merchandise as I'm using fb and it gets really all over the shot doing everything via inboxes.
Just want somewhere they can easily purchase our 4wd club merchandise.

and on top of that im now being asked to buy a domain?
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