Coin Stores In Colorado

i will be in colorado in denver and littleton in late sept. from the 21-25 and would like to hit some coin stores for some junk silver. what stores should I go to that will let the average collector walk in and buy some. what can I expect to pay for junk silver? and what coin stores have junk silver boxes I can look through. if you could post the address and name of the coin store that would help me out. thanks.