Although my health precludes doing much RF design and construction these days, I see you can buy TX and RX module pairs for 433MHz for about £3 with free postage on eBay. I guess a half capable designer could build a useful
pair of transceivers for local 70cms AM comms for under £10. There may already be designs published, although I've not seen these. If you have, please share a link.
Try looking on eBay for "433MHz RF modules". To a capable designer, these could be quite useful. No doubt with a bit of digging you can get these for even less!
UPDATE 1345z: Check out the
YouTube videos by VK3YE who has done some interesting tests with similar modules. It appears you can get FM or AM with these and some useful ranges.
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