The pricing is public knowledge on their website. We know from the pricing of the S1->S3 upgrade kit that the savings are minimal and are probably negative if you allocate a cost to your time to assemble the thing and it definitely goes negative when you calculate in the cost of the loss of the old miner which could have been sold as well as the loss for the time it take for them to release the upgrade kit (it took them over 2 months (IIRC) to release the S3 upgrade kit), so you lost 2 months of the difference of hashing with an S3 vs. the S1 at a lower difficulty. If you want a project, pursue your upgrades. For Bitmain it probably isn't worth the hassle. I'd rather have them focus on the S6 or S7 than be wasting time trying to save you $5.
Thanks for being the thread troll.