Interesting choice of marketing. Selling TCredits isn't something most people think of.
I would advice that you seek out penny auction enthusiasts at the penny auction forums. You can advertise Pricebenders and add a text ad below offering a variety of TCredit packages. It is advisable not to go straight in with your promotion before you have built some sort of reputation in the forum. People are more likely to buy from someone they know and trust.
Another platform to promote TCredits from would be a blog. If you don't already have one, you could set up a blog about Pricebenders. Talk about your experiences and your wins. Display the dynamic Pricebenders banner at the top of your blog. Your blog is now a great place to advertise for TCredits.
I have seen a few answers referring to social media. If you're going to use social media, I strongly advise you build a relationship with your audience before plugging your products. There are so many people out there promoting their products and services, we tend to switch off when we see them. If you're going to use a platform like Facebook. Try to promote yourself first by ensuring your posts have good content. Once you have an audience who you are interacting with, you can start to advertise your TCredits.
Selling TCredits is an excellent idea but know your audience and interact with them before plugging your product. You will get more conversions this way.
Interesting choice of marketing. Selling TCredits isn't something most people think of.
I would advice that you seek out penny auction enthusiasts at the penny auction forums. You can advertise Pricebenders and add a text ad below offering a variety of TCredit packages. It is advisable not to go straight in with your promotion before you have built some sort of reputation in the forum. People are more likely to buy from someone they know and trust.