The dollar has weakened since; about 1.35/euro. Sorry, don't know about the zloty (can't put a line through the l). But remember that EU prices are normally posted at what you actually pay -- price + VAT/TVA/MWST usw -- while US prices are normally quoted (fairly dishonestly, in my view) net of admittedly much lower sales taxes.
Thus $4.50 less 20% VAT/TVA/MWST is about $3.55 net of tax, and $3.55 including LA sales tax is around $3.90. Internal sales tax in the USA for mail order is something the Treasury will have to address sooner or later.
Cheers,
R.