I am afraid you are asking for the impossible here. The best AND the cheapest just doesn't happen in real life. Not with WLs, not with anything.
The notable exception is Ginza where you can get good quality girls at low prices but they don't do outcalls anyway.
So if you want young hot petite busty outcall WLs then places like Bluemoon, MOC and TMC are your best option. But you are looking at $300-$350. If you want top quality you have to be prepared to pay top dollar for it. If anyone knows any exceptions to this fundamental economic rule please let us all know. Personally I think the outcall girls are worth every cent.