Alas, that's the interbank rate that Nickmo's site used.
If you have $$ notes and take them to a BdeC you'll get the tourist rate - just short of �87 - assuming they don't charge any direct commission. Less if they do.
Hi dzug - 'no warranty or validity implied or given' - agree bdc will give a different rate within a small %age, but they will also differ - hotel, multiple, high street - xe are handy as a starting point anyway - especially if you want to know what your koruny would buy you in soles.