get a 1.25" threaded coupling x 1.25" slip on the other end and use reducer bushings to your needs..reducer bushing with 1.25 slip on the outside and 3/4 female threads on the inside of bushing then get a barb fitting to you likings..Lowes has all you need in the small pvc pipe fitting isle..
Also try sprinkler fittings. Don't know if you have a Menards out there but maybe you can find at Home Depot
http://www.menards.com/main/search.html?search=sprinkler+fittings&page=2
* or look in the sharkbite plumbing fittings for plastic barb adapters at HD
I didnt think the male threads were garden hose type. But hope it it works for you
the local mom and pop store will probably not have the right little pieces unless they oddly specialize in plumbing supplies. lowes is usually the best, but it can vary.