Yes, all well on this end. Been cycling more than playing with computers the last 4 yrs. About 60 lbs lighter now that I've learned about portion control, but I sure do miss visiting the local AYCE Chinese buffets. 😀
Based on the wording of the opening post, it would appear that the poster is not looking to buy directly from MS, but instead, looking for alternatives as forum members or key sites are both referenced, but MS isn't.
They sold for $45-$50 when first introduced for DDR1. Except for that lot that you mentioned someone had on eBay, they are somewhat collectibles and seldom seen for sale.
Are those kits of KHX DDR3-1600 16GB kits, each with a pair of 8GB modules, or an 8GB kit made up of 2x4GB. Your description states 2x8, but the model number looks to be for a 2x4.