Go to the Amazonas website, click on the Shop tab and it takes you to another website that is the seller of the back issues. I bought mine through them, paid online and received the magazines within 2 weeks.
You can get a price break if you buy multiple issues. Double check if some are in stock or not. The magazines were still wrapped in original condition.
Eheim Pimpette #270
Eheim Pro II 2028; Classics Series -2215, 2217, 2260, 2262; Pro 2229 Wet/Dry