Where can I buy a 45 record player?

My mom has this really awesome old record player that plays 45's on
it. I really want one. My mom said that she'll buy me one in October
for my sixteenth birthday, but I have to find it. I have absolutely
no idea how much they cost, it would be really awsome to find one for
less than $300 because my family doesn't have a lot of money. Any
style is fine, it just has to be able to play 45's. :)

Thanks in advance to anyone who answers!
Ps. I don't know what category this would fall under.