Some things not alllowed to export to Canada from US can be exported GB,etc  

I would not mind going to the States, but the trouble is I do not have that much American dollars and kept wondering whether when we do go to the States, if they would accept my Canadian visa credit card or whether they would say that they cannot sell the software to Canadians.

I don't know about all that. I know that in the Plattsburgh, NY area, my area, in an excellent year, 50% of most goods and services are bought by Canadians. In a bad year, less than 10% and many businesses go under or find ways to hang on until the situation changes.Canadian money is accepted here according to the exchange rate. Also there is one currency exchange place here.

Most banks will exchange money from one country to another if you have an account with them. Not sure about visa Canada. If you know what places you will be going, you can call ahead. You will also need to call customs to find out what can be brought back and forth across the boarder. They may give you a website to check or send you a pamphlet.

Below the Plattsburgh area, we have to be very careful, they've never even seen a Canadian penny and wonder what that "funny money" is. Sorry I'm not much more help. When I studied in Canada, I had to buy records and cassette tapes of French because I couldn't get any Canadian music in the states. I was allowed to bring that stuff back as long as it was less than a certain amount, over that, I would have to pay a duty. But that was in the 1980s. Do you have any friends that go to the states? Maybe they know the answers. Things keep changing. Take care.

My husband would not stop at any big stores until we came to North Dakota and we got there too early. I do have a US Canadian Dollar Account but not enough money in it to use. We went through Maine and they have some French Americans there, so it might be you have to go there to buy anything French.