Hi there. I have a marketing firm called South Lake Promotions, where I help rural micro businesses in the Inland NW. This is a long answer, but bear with me. The answer to your actual question is at the bottom because there are some things that need attention before you post an ad, imo.
What you need right now, considering your goal, is a kamakazee marketing campaign. (Good luck finding talent willing to drop everything and do this for you). Maybe you can do it all in house.
First, get started on an effective Landing Page with convincing copy and a convenient Buy-it-Now link right up top.
Any marketer worth their salt will say your carefully nurtured mailing list is your most promising asset. Send out a Holiday greeting/special offer to everyone on your mailing list, like buy a pack at regular price and include second at a discount. Offer free shipping. (Use some of your advertising budget to defer these costs).
Include a link to your thoughtful and convincing Landing Page that makes it super easy to buy. Don't force your potential customers to scroll down and hunt for the button, as is the case on your merchandise page. Put the button right next to the picture of the cards.
On your email, landing page, and any other copy you create, make the content about the BUYER not the seller.
For example, look at that rambling explanation on the merchandise page of how the cards came about. Move it down the page. The prime real estate ("above the fold") provides about two seconds to grab people's attention by telling them what the cards can do for THEM. What do the cards do for them?
Tell people the REASON THEY NEED THE CARDS
Effective ad copy takes time to develop and test -- and time is what you don't have since you want to sell a lot of cards by Christmas. So, I suggest you put out a forum post that asks people -- What would you say if you had two seconds to tell the world why permaculture is crucial? You might also ask for an image or meme that can powerfully convey this message. Facebook is a good venue for this kind of stuff.
Whatever you come up with, use this consistently as the header for the materials in your campaign.
Scramble your forces and get a 1.5 minute or less video together of people -- including kids -- having a blast during Christmas playing with the cards. Maybe you can get some plotkateers who already have their cards and their Xmas decorations up to submit the visuals for you. Audio should include your REASON why people need the cards. Tag the video well with SEO keywords.
Post it on Youtube, vine, and Facebook video. Connect it on Pinterest, Instagram. Open with your REASON. Link video to your landing page.
After deciding what advertisers you want to use, design a compelling banner ad according to their specs that links to your landing page.
Now, finally, here is an answer to your question. This answer is based on a quick web search. The resources have not been vetted by me. They are a starting point for you to call reps and get more info.
hortmag.com
Average of 100k page views per month and 35k unique visits
Contact: Michelle Kraemer 888.427.2873 x 13245,
Michelle.Kremer@fwcommunity.com
Media Kit:
http://media2.fwpublications.com.s3.amazonaws.com/BLA/2015HorticultureMediaKit.pdf
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