We are very lucky to have our own small baler. It cost £500 (very second hand) many years ago and has been so useful, enabling us to make our own hay and to bale straw into a manageable size. But it does of course take longer to bale using it than the giant big things which zap round and transform a field in no time, so only a few people still use them. We have an arrangement with a neighbour to bale a few straw bales straight from his field in exchange for eggs - or we did but it might not be working this year. The alternative is to buy in a few big bales and rebale them on a dry day, which we have done before. All I can think of if you can't find someone who sells small bale straw (which is much less common than small bale hay) is to find someone with a small baler and ask them to rebale some big bales for you. Complicated I know.