Yes, you can still play by paying through PayPal. As you go through the normal purchase process, you'll see an option to pay with PayPal. Just click that option and follow the instructions to log into your PayPal account and submit payment.
Mail Orders are no longer accepted. For those who are hesitant to use credit cards or PayPal, pre-paid credit cards are a good option.
If for some reason you're unable to pay via PayPal or credit card through the payment page, you can send a PayPal payment to email@example.com. Make sure to include your username. Also note that there is a $1 handling fee for these type of PayPal payments. The $1 is taken out by WhatIfSports, not by PayPal, so you'd need to charge $13.95 in order to have $12.95 available in your account.
Note: Paypal payments won't be added to accounts until the payment has cleared (usually within 24 hours). Also, if paying in a currency other than US Dollars $, please factor in the current exchange rate. Your payment will be converted into US Dollars $ and then processed.