well, there are cheaper options but checker is right...expect to spend quite a bit.
i disagree about the airpump and airstone you can save money on those as you don't really need them but i think i'd lean toward larger tanks.
a ten inch turtles needs a minimum of 10 square feet of swimming space (surface area) so i'fd go with nothing smaller than a 120 or 125 standard. a 180 is better.
but you can get the same amount of space from a really big horse trough pr stock tank for less money (but if the visual appeal is an issue a tank maybe be a better option)
uvb lights are really needed (though you should still supplement the food and the water with calcium with vitimin d3) but we seem to be finding that the mercury vapor bulbs work much better than the long tubes so you can at least get just one for heat/uvb that way.
you will need a ceramic fixture for it though.
and lots of filtration:
(look at canister filters and maybe powerfilters like the aquaclear 500).
make some basking spots and caves (two of each is enough) large pieces of bark are ideal for this and can often be obtained for free if you live near a wooded area (don't kill trees or rape forest litter though, please).
You should probably invest in something to help you drain the water.
If you look at it as a possible certerpiece for some room and aim to make it very attractive, you can do so while still meeting the turtle's needs and that way (for some people, at least) it doesn't seem so hard to part with the cash.
Or if you don't care how it looks but wanna do it cheap...look at the posts mentioning stock tanks and feed troughs and follow the links in them to the sites that sell these. They offer more space than all but enormous tanks but have some disadvanges too.
good luck.