I have a crate in the car which is a 36" one - it is a bit tight, especially heightwise, but it's the only one that does fit in the car! In the house for night time I have a 48" crate which is plenty big enough for JJ to stand comfortably and stretch out full length in. The best prices I have found are on ebay. JJ was used to a crate having been confined as a pup with his broken leg and he still seems to associate it with security and he is very relaxed about using it.
We have a 48" crate (the biggest size, I think) which absolutely dwarfed Pearly and she loved it! We don't use it now, though, but it's good to have it as a back-up. It was £59.99 from eBay - a place in Wales somewhere, if memory serves me correctly. Very swfit service - it was here in 2 days. If you're thinking of getting one from this place, might be an idea to order a clip-on bowl as well. We forgot to then had a helluva job trying to find one.
I think I did see a 52" crate, again on ebay, what a monster that would be - big as my son's bedroom (nearly). I too paid £59.99 for the 48" which came with a bed. Like FAJ delivery was very prompt. The supplier was, as far as I remember, the pet shop, rugely, or something like that. By the way, I have two tray types, one metal and one heavy duty plastic. If you have a choice take the plastic! The metal makes weird noises every time JJ moves, presumably as the metal flexes - very irritating!
My new cage arrived yesterday. I searched the net and came up with a good quality one from DOGHEALTH.CO.UK
48 -30 -33 inches galvanised and hammerite painted with plastic tray for £63 inclusive of delivery.
Filled the cage with comfy duvet ans pillows - left the door open. the four dogs all tried it out during the day - the lure of a plumped up duvet - what greyhound can resist.