Pass. I usually see MS-65 NGC Washington P&D on ebay at times for that price (that's how much I paid for my set). Actually, most of the president dollar coins can be bought like that. I've been assembling a set of these coins in MS65 grades, NGC slabs, and I normally pay no more than $6 for the P&D of each president. That price also includes shipping.
Why would you want to pay $5.49 for one that is just BU and isn't assigned a numeric grade? Having one in a slab like that is worthless. If you just want a plain old BU Washington $, you can buy 10 rolls of them from the Mint for face value with free shipping. Find the best one of the lot, and then deposit the rest into your bank account. Who knows, you may even find one or two missing the edge lettering. Chris