This isn't so bad, considering it's two transceivers. I've purchased passives from this vendor, too, Mahmood, so you needn't fear that they're a fly-by-night type.

About a year ago there was a thread here which led me to some 433 MHz hardware that cost about $4 for a transceiver, IIRC, but the doc's were hard to read (poorly translated and full of superlatives though thin on real information) and it wasn't clear whether the price was for q10 or q100k.

What I personally want is something that will reach 10 meters within the house, and perhaps to an adjacent garage, etc, but not necessarily line-of-sight as there will be walls, etc, in the house. It's really cost-sensitive, because each application could use upwards of 5 dozen transceivers though the cost per installation must be reasonable.

It has to be reasonably immune to RFI, though households are full of it, and it mustn't open the neighbor's garage door, etc. I have an RF-controlled ceiling fan in my bedroom that often starts up or turns on the light when someone else does something ... somewhere ... <sigh> ...

RE