I stopped by local REI in Encinitas,ca. and was looking at the buckles and plastic hardware section and they had 3 sets of hitex quad buckles for $1.50 a piece. Same as the ITW nexus ones for one inch webbing.
If you call the the Encinitas REI phone (760) 944-9020 they will ship them to you, I did this for a pair of Lowa renegades lo tops at the San Jose store that sold for $28.83 on clearance. Rei customer service gave the names of the stores and I called them till I found them.
I did not find the hitex quad buckle on the Rei web site.
Also with my rant about REI in another thread, like I said I have love hate relationship with them but when you have a REI less than one mile from your house it has become way to easy for gear junkie like me to stop by and see what they have on clearance. They have a bunch of kids comet back packs for you guys that have children who backpack in the clearance bin. Antifreeze puke green Gregory Z30 women's packs in the clearance bin also for the women in your life.
Hope this helps you out,