LOL! Sky's the Limit as they say!
While there are "inexpensive" crossbows out there, the old adage "You get what you pay for" largely applies.
If you're looking for pin-point accuracy and speed at distance, be prepared to drop a few sheckles.
With all the add-ons, custom work and custom arrows, I'm now into mine approaching $ 2K!
On the positive side of the coin, it will break tea-cups at 100 yards every single time, which turns hunting range efforts into "chip shots" under most conditions. And as I now carry it afield more than any of my rifles, I can justify the expense to myself (although we AIN'T going there with She Who Rules!! )
Cheers,
Nog