Sorry can't speak about private agencies, but I can suggest that you get access to the in-house donor pool at Shady Grove and Dominion Fertility (both in the VA-DC-MD area)and RBA (in Atlanta) to see what asian donors they have presently. Although asian donors are harder to find, these three clinics typically have at least a few (~2 to 5 depending on the time of year) available and offer a pay-as-you-go as well as guaranteed DE program.
DH (Caucasian) and I (Asian) are currently expecting a boy end of August, from our first cycle with SG Shared Risk DE program. After 3 years of TTC, we realized that we did not have the resources to continue to play the "baby lottery" and that we just wanted a baby. We specifically looked for clinics that offered a guarantee DE program, and SG and RBA were the top two clinics that we considered since we live on the east coast. As luck would have it, a perfect asian-american donor became available right around the time we were approved by SG, so we went for it. Now, I am 24 weeks preggo.
Best of luck with your search!