I have been keeping this thread in the back of my mind with all the other stuff in there and while searching still for better prices I found this.
frayedknotarts gave us this in another thread (http://igkt.net/sm/index.php?topic=977.0).
... http://www.rwrope.com R&W Rope (Bob Dollar). ... Also a traditional rigging shop and access to most of the things you'd expect there: Stockholm tars, fine manilas, even better man-made manila-like cordage, hemp twine, marline, palms, needles, blocks,, etc.
They have Marlin Spikes here:
http://www.rwrope.com/traditional_rigging/Catalog2008/Davey%202008%20price%20list.pdf
1482/OO/150 SPIKE MARLINE 6" PENCIL POINT $ 19.06 ea
1482/OO/200 SPIKE MARLINE 8" PENCIL POINT $ 20.88 ea
1482/OO/250 SPIKE MARLINE 10" PENCIL POINT $ 23.32 ea
1482/OO/300 SPIKE MARLINE 12" PENCIL POINT $ 31.28 ea
1482/OO/350 SPIKE MARLINE 14" PENCIL POINT $ 32.26 ea
1482/OO/400 SPIKE MARLINE 16" PENCIL POINT $ 33.45 ea
1482/OO/450 SPIKE MARLINE 18" PENCIL POINT $ 40.50 ea
They also have the Swedish Fids
2478/SS/170 SPIKE HOLLOW STEEL 6.3/4 $ 19.50 ea
2478/SS/285 SPIKE HOLLOW STEEL 11.1/4 $ 23.53 ea
See here for pics:
http://www.rwrope.com/traditional_rigging/Catalog2007/Tools.pdf
Good luck and let us know if you find them in your price range.
From what I can find, I think to reach your $10 limit for buying a marlin spike you’ll need some luck at yard sales. lol