You should be able to post in the Marketplace as a standard user. Navigate to the relevant forum then click on "Post new thread". Please remember to include your (rough) location in any sales threads.
Time tends to get away from me, but it must have been at least 12 months ago that the Marketplace was opened up for everyone, Stu made an announcement at the time.
Of course it is still possible to subscribe for those who still wish to contribute financially toward the site expenses.