Can't leave well enough alone... gotta say more.
If I were looking to purchase the receivers FROM you, then no, I wouldn't expect any kind of special deal on two of them. I'd still ask, because y'know, it's my money and I /do/ want the most I can get for it. The longest I've ever spent haggling was 20 minutes, and it saved me a good bit of money. (I was buying one pistol new and another used, and they cut me a better offer on the used pistol if I bought them both that night.) Of course, most vendors seem to havve a bit of "haggle buffer" built into their prices.
I never ask "What's your bottom line price." That's rude. I usually ask: "Is this price firm?" I don't ask unless I have the money and I'm serious about buying. If they're willing to talk further, we talk. If not, I thank them and move on to the next dealer.
In this particular case, I already know where I'm going to buy the receivers. I'm just looking around for someone to receive the order and perform the transfer. Frankly, to me, it looks like it would take a total of 15-20 minutes of their time. Most folks I've talked to in the area want $25-$25 per unit transferred. I'm not going to pay $70 for 20 minutes of an FFL's time. That's not worth it to me, no offense.
I found someone who will do rifle/receiver transfers for $25 + PICS per transaction, not per unit, and they're the one I'm going to use. They're a bit out of my way, but I have relatives in that area (30 minutes) and I can visit them after I pick up my order.
If the first guy would've done it per transaction, I would've gone with him, even at $35. He's 10 minutes away and I like the guy. But he wants $35 + $35 + $5.
Thanks, everyone, who took the time to respond. Interesting thread.