You can find best tips about cash and credit cards in Iran in this article
If you are interested to travel to Iran you can find the best Iran travel advice from here
You can find lots of useful information about how you can obtain your visa on your arrival to Iran here
You’ll find lots of useful information about how you can apply for Iran tourist visa if you are a UK, US or Canadian citizen and you would like to travel to Iran
Final update about visa stamp(approval) fees for Iran tourist visa.