Hi Welcome to the forum, you are right you do get a lot of car for your money, with lots of toys, I mean features. I do not have one in my Yeti but I did have a liner from hatchbag in a previous car. They don't seem to list the Yeti but a call might be worthwhile as they did not list my previous car either.
Hi Dave, and welcome. I have a rubber boot liner in my vehicle and I think they are great. My wife carries a fair bit of grocery shopping in the boot and if anything spills then its an easy job to take out the liner and hose it down. Just one thing, I would recommend a liner with a raised edge or a lip on the edge so that anything liquid is contained by the liner. It's worth the little extra to buy one of these. There's not much worse than a boot carpet soaked with full-cream milk that has leaked out of a broken container.
The liners will vary in size according to whether you do/don't have the spare wheel option.
Hi Dave and welcome too. Re Boot liners depends on what you are looking for I suppose permanent or temporary. For trips to our local recycling centre with bags of garden cuttings, etc I use a cheap waterproof liner. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280771492780
(They advertise with model specific names in the title on Ebay but they are all the same size so go generic and pay less)Gives a reasonable fit.