In my opinion i think it does make a difference, i think things usually tend to pick back up late July. It's not necessarily overly busy, but i do think the couple of months leading up to the end of financial year tend to be some of the slowest periods in retail.

I guess it all depends what category of products you are selling though. Some areas do really well around this time, like office expenses etc will tend to go up in sales so people with businesses can then deduct these expenses off their income. For luxury items though i think this time of the year is usually quite dead.

I also work part time in an electronics store as my other job, and the last few months in both my business and my part time job have been ridiculously slow and the only sales that seem to keep the company i work for afloat at this time of the year are the types of products that i think would be claimable in most businesses. (Printers, phones, modems etc) whereas any items that really only provide entertainment, sales have dropped considerably, but usually pick up in the new financial year.