There are many different places you can go to look for telescopes for sale. However, you are going to find that not every one of them is going to have a large selection, nor are they going to have affordable price. If you want to find a large selection to choose from, all of which are going to be priced at well below full retail price, you need to avoid shopping in the regular bricks and mortar stores.
The problem with shopping in the stores is that they are charging full retail prices on everything they sell in order to ensure that they make enough money to cover their overheads and have enough left over to make a profit. When you shop online at places like Telescopes.net, you are dealing with a company that has very little in overhead, which in turn means that they can afford to keep their prices in line with what you can afford.