Yup, that's what you usually get - it should be green, soft and sweet smelling. I don't think Timothy hay is grown over here - I've certainly not ever found it sold by the bale, only in small bags for about £8 a bag! The pigs love it but you'd have to be pretty loaded to supply it as their staple hay for eating and bedding!
Remember to look out for ragwort in hay as it's poisonous to guinea pigs. Most farmers are good at picking it out as it grows as it's poisonous to horses too (who they usually supply the hay to). I have heard a couple of sad stories about it though, so as you're dishing it out, just keep an eye out for it. Here's a link to a picture of it (broken link removed).