I could be wrong, but I don't think this is a problem. You can't link to an order page. Product orientation and whatnot.
8. Members agree that, except with the owner’s prior consent, they shall not solicit or promote any products services or other sites by posting direct links of any sales pages of any products in this forum. Discussions of any products are allowed and encouraged, and links to Technical Data or MSDSs are allowed, provided that it follows the topic discussed.