Having worked a time in audio retail, this is just not practical. This is such a costly business to operate. Unboxing and reducing the value of even more components, and the additional work of actually switching arms out just makes it an even lower profit business. Hifi shops would disappear even faster than they are now doing.
A couple of bits of advice. First of all, spend most of your budget on the table itself. You will be better off, and you can upgrade an entry level arm later on. Reviews can be helpful, but I find some are skewed, and full of hyperbole. Forums such as this one are a great asset that we now enjoy. Finally, see if your local shop will let you take a turntable out on approval. Hearing it on your own system is the only way to know for sure.
A couple of bits of advice. First of all, spend most of your budget on the table itself. You will be better off, and you can upgrade an entry level arm later on. Reviews can be helpful, but I find some are skewed, and full of hyperbole. Forums such as this one are a great asset that we now enjoy. Finally, see if your local shop will let you take a turntable out on approval. Hearing it on your own system is the only way to know for sure.