Cinematique Instruments make affordable Kontakt (full Kontakt req'd, K4-compatible) libraries. Prices are already pretty good, now they're 30% off for the month of September.
 
Examples:
Tambourine, shakers or bongos,  $12 each
Kantele (I use this one, great for layering with an acoustic guitar) $15
Percussion set, $25
 
 
 

Picked up the Lute myself. Have a lot of their stuff. Ronroco and Monochord are favorites.

I just nabbed the Saphire 60, I have a weakness for unusuall vintage keyboards. This one is instant psycadelia and I am sure it will get some use.