I bought this:
20 for $72 shipped ($3.60 per sensor). They also have a 40 pack option, but it worked out to $3.75 per sensor.
You may be disappointed with the v1 sensors. They do not route through repeaters, so all have to be within range of the hub.
@SmartHomePrimer Ah ■■■■. Wish I had known that. Is it just joining? Or will they never route though a repater?
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Yeah... I read that after the purchase had already shipped.
I don’t have any, but from @dan.t ‘s post, it would seem they do not route. End device to controller only.
The only time I've ever had any issue (about 5 months now) with them dropping off is when I had the hub shutdown for extended periods of time, otherwise they have been super reliable and frequently update temp readings.
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How far can you get from the hub?
My farthest one is approximately 40 feet and 3 walls in between.
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These are the Iris 3320-L v2 Contact sensors... I have a few around the house and they work great. No issues so far. I bought some magnets on ebay as well, and use 3M COmmand Strips to mount both parts.
The V1 contact sensors can go through a repeater once they are joined to the hub. It is the joining procedure that can’t go through a repeater.
I only had them drop off once, but I had 35 drop off at once, which was no fun.... that’s why I replaced them, unmounting them all for rejoining put me over the edge...
I replaced them with the one @ogiewon had listed in the post above this. They work great for me
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Thanks for that info Dan. In my small house they don't have to go through a repeater to join as every device can hit the hub without a repeater except one... my mail box sensor.
Thanks for clearing up my confusion. Sorry if I raised anyone’s anxiety levels 
OHHHH you'll burn in hell for that one @SmartHomePrimer. Resistance is futile. 
I am happy to know that it just won't join through a repeater. I have no more than 20 feet in any direction of my hub, so I'll be fine, I think.
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The fire’s already lit. Just another log! 
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Actually, I'm glad you mentioned it. We don't always think about those things. Should have done my due diligence on this one, but the V2's weren't selling with magnets and I wasn't sure what would work as a replacement.
It would be nice if things like this were mentioned on the Hubitat " List of Compatible Devices".
It's a matter of updating that with correct information. Then, what is the cutoff? What becomes TMI? Slippery slope.
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I actually just had this happen yesterday for the first time, but I only have 16. Fortunately all were about at the stage that they were needing batteries replaced anyway, so I covered two birds with one stone. However I think I will go the same route and get some of the 3320-L's for standby for IF/When this ever happens again and swap them out at that time.
Right. Ittliterally a list.
It links to the Join and Reset instructions, but then that would be a muddied doc, not unlike the often difficult to read manufacturers instructions, instead of straight to the point, easy to follow guide for just that singular purpose.
