It's much easier in the US. Box, painted and wood turtles and some of the Mediterranean torts are often under $50. I paid $38 for my Russian tortoise, although he is a wildcaught as most are. You might find breeders at reptile expos or can apply to adopt a captive bred tortoise from organizations such as turtlehomes.org.
Turtles and torts are ramblers in nature and the bigger the enclosure you can provide the better. My tort pen is 4x4 feet and that wasn't big enough to keep His Majesty happy so I gave him to my sister and her kids where he can have a 12x8 outdoor pen for most of the year. They need good quality ultraviolet lighting during their waking hours.
Requirements will vary depending on species.
www.chelonia.org has a number of good caresheets and info.
Hay such as Bermuda, timothy or orchard grass is a very good substrate for grassland torts. Omnivores like box turtles can handle mulch or coconut husk substrates but full herbivores tend to get impacted on that kind of stuff.