If you're getting the standlee compressed timothy, the quality varies depending on what crop, batch, etc your store ends up having. I've bought standlee for years for my rabbits and I've had really nice bales that my rabbits absolutely love, to complete crap full of weeds, dust, or crappy brown clumps mixed in, where I've either had to pick through it, throw out half the bale, or just return it. So it's really a guessing game, particularly if they are the bales wrapped in plastic and you can't see what's underneath.
Sometimes in unwrapped bales there will be a pile of loose hay around the stack. Ask the store if you can take a handful to try it out on your rabbits first to see if they like it, before buying a whole bale. You just want to make sure it's clean and absolutely uncontaminated by anything nearby(such as fertilizer). I would suggest not getting a sample that's been on the floor.
If you do end up with a bale that your rabbits really like, I would suggest buying more bales from that same batch to store for later if you have the space to do this. That's generally what I've done over the years to make sure I have a continued supply of good hay that my rabbits will eat.