Honestly, I wouldn't skimp on the quality of your leathers. I remember reading a story (I think on this forum) about a girl who's leather broke in the stride just after a jump, and it threw her off balance, which lead to her spurring her horse in the side, and the horse bucking and freaking out. She fell, bad things happened, the horse was traumatized, etc.
Also...with cheap leathers, the dye will rub off (onto your boots and your nice new saddle's flaps). They also probably won't have smooth beveled edges, so they'll scuff up your saddle's flaps.
You just got a Bates saddle, right? I rode in a couple before and I remember that the leather on the flaps is very soft and smooth. So I would really recommend calfskin lined leathers to prevent scuffing up those nice flaps. Bates makes them, so they'd color-match perfectly. But yes, they are like $100. I've also seen very nice ones by Arc De Triomphe. You could probably find some on ebay
for a little less. As for non-lined leathers, I've liked Stubben and Courbette leathers (and they'll be a little less expensive-especially on ebay).
Heck, you can always just ride without leathers & stirrups! It's free and your legs/seat will get really strong!!!