I have a collection of ,45s where can i sell them

Check used record stores in your area. Or a place that sells dj equipment and records.

Try ebay or Rasputin music.

How much do you want for them?

Selling your collection at eBay will probably give you the widest possible exposure. I recommend you sell the entire collection together without permitting buyers to pick and choose. Establish a starting bid you believe is a fair minimum price you would accept for the entire collection and let it go from there. It helps if you weigh the collection for postal shipping purposes so potential buyers can see what the delivery charge will be. You might even want to check local museums or libraries to see if they are interested. Sometimes the attribution you might receive for donating the collection is worth more than the money you might receive for the collection itself.

Ebay.com
craigslist.com

are the best two choices i think. and sell it as a lot, not as one here one there.