Paying in Euros !!

I use a prepay credit card for all my online transactions.  Yesterday I put  25 euros on it to bring my balance up to allow me to  purchase 50000 EC.  When I went to chose how much EC I wanted the list said that 50 000 EC would cost me 36.96 euros, my card balance was 37.58, however when I clicked on the pay now button I got a notice saying that there was a problem with my payment and I would have to wait 24 hours.  I checked the balance on my card and I had enough money on it, but when I checked it today it turned out that I had insufficient funds - the transaction turned out to be 38.11 euros and not 36.96.
I tried to make the transaction again a couple of minutes ago and I again clicked on the 50 000 EC which resulted in the "wait 24 hours" message.  I've just gone back to check my card balance again  and it turns out that today it would have cost me 38.17 euros an extra 6 cents.  
So what I want to moan and complain about is the fact that there is no set price in euros.  Had I known that I was going to be 1.21 euros short I would have put 30 euro on my card instead of 25.  The result is that I now have to decide whether to purchase (tomorrow!!) a lesser amount of EC or  waiting till next weekend to put another 20 euros on my card, as that is the smallest amount of credit that can be purchased.
I know paypal do the transactions and use the daily currency rate to convert to euros, but the price on the list on your page never changes .  Is there any particular reason why we cant have a set price like those paying in dollars, or is there a reason why all of our transactions cant be done as dollars which is the case with a lot of other game sites.  When I used to buy downloadable  games they all cost $9.99 and if I was buying some games or paying my game club fee I would use a currency convertor to see how much I needed to put on my card,  on that given day.  This  current situation is a real pain the @$s because the difference in my balance and the actual price is so small.  Whereas if I can pay in dollars, I can use a currency converter myself to check the actual amount of credit I  need to purchase on any given day. 
So please, please, please will you consider either deciding on a set euro price or that prices are given in dollars only.

When I say your page I mean the super reward page that lists the prices in euros.

Thanks for the response Bers but SMS payment is not an option for anyone outside the USA.  And I can only make a couple of transactions per year without using paypal for fraud prevention ((.