I've gotten a LOT of fresh peppers through Jim Duffy, Refining Fire Chiles. He deals with the growers, has a lot of growers all over the country contract growing for him and can usually handle large orders, especially if you get your order in early in the season.
The growers ship fresh pods directly to me, I paid to Duffy, he paid them. When co-packing for Candice at Wildfire Chillis in Australia, she dealt with/paid Duffy, the peppers arrived at my place and I processed them for her sauce.
One fall, I hand processed about 450 pounds of fresh superhots (7 Pots and Morugas) and 30 pounds of fresh fataliis (wash, de-stem, trim, dry or freeze or grind). The majority of the chiles arrived in good shape, especially if the shipper packed them right. One shipper put the pods in plastic bags (BAD IDEA!) but usually the chiles were packed in boxes about 20" square with layers of paper towels to keep moisture accumulation down.
If you know ahead of time, and depending on how much of what you want, there's a lot of growers on THP who could maybe help you out. I could try posting some names if you'd like, but I know I'd miss some.