"for a good price?"
All depends on what that means. Cheap? You get what you pay for.
Since a filter is altering your image, make sure the filter is not so 'cheap' that it ruins what your photographic vision is.
Me, I put the best filters on my lenses since the lenses are what shape the image. B+W, Hoya, Nikon, etc. The thinner the better.
Since you did not tell us what you've envisioned in using filters, we can go into more detail.
For B&W, a yellow, orange, green and red are the basics. For color film, you need a polarizer, color correcting and color compensating filters. Of course for Infrared, you can get away with an R-25, but I'd invest in near-Infrared or true Infrared filters.
Good luck in your quest.