Oh... I don't know about best place... I am just a hobbysist and have been making bows & clips for less than a year, but this is where I got mine:
this seller: http://myworld.ebay.com/jpribbons&ss...84.m1543.l2533
this listing, I have most of these sizes; the 32 mm = 1.25 inches and is a good size for little clippies for babies, IMO: http://www.ebay.com/itm/FLAT-Alligat...item2a215bdbc8
The cost is $2 for 25 of them, plus $2.45 for shipping. I have ordered twice and ordered about 100-150 clips total each time. A couple in each of these two orders arrived bent, but the seller had thrown in extras so I think I actually still rec'd more perfect clips than I paid for. She also responds super fast to email questions, and I THINK she can do custom mixes (like if you wanted counts/combos other than what's listed on ebay). Hope this helps!