...because they're getting annoyed with the question. It's been asked more than a couple times, and people are just tired of reading it. Do some web research first. There are a million websites out there that discuss different morphs, combinations, breeding, etc. Try google.com. It's a good place to start.
If you have a more specific question (ie. if I combine a ___ with ____ what are the odds it will create ___) I know people will answer, but if you just say "what can I get for a pair and what will it create, and keep it under $100" (or $60, or $75 or whatever your budget is that day), nobody really wants to answer that.
It's really hard to want to help when questions are vague and repetetive. Do a little research and try again, and I'm sure some of the very knowledgeable breeders on here will answer SPECIFIC questions.
Also, I have to side with kilidraven who discussed the appropriateness of a 13 year old planning to breed in a year or a few years. Your life will get busy, and if you head off to college, it may get crazy busy, so before you go an invest a lot into a future breeding program, stop and think about the logistics. Especially if you already have other lizards or snakes. Landlords and residence co-ordinators aren't too keen on students showing up with a room full of aquariums (note: the rooms are usually about 10ftx12ft, there isn't any space for anything other than your bed, books, etc). I know I'm getting down the road a bit here, but leos can live for 15-20 years, so be careful now, rather than resorting to a rescue later.
I know that's probably a lot of long term planning to lay on a 13 year old, but it's my opinion.
Try not to take this too personally, I'm just trying to lay out the facts for you and give you a heads up. Hopefully you'll post a specific question and someone will discuss the genetics. Search back through the forum for some really good questions on pairings and probabilities of certain offspring (you'll get to probability and statistics in highschool).
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Blaine
0.0.1 HY/Patternless/Normal Leo (Echo)