Well, if you're just starting to ride stocks will be fine.
The cheapest sftermarket fork i would say is an SZ fork you cang et them for around $25.00 USD off people but the new ones with a welded reinforcment on the inside of the fork tube and reinforced legs are $55.00 USD at titetoyz.com
I have the old SZ fork and I ride pretty hard and it works fine so yeah.