Not to difficult to make your own. You need some 8", and 6" pvc pipe. Cut the 8" pipe 18" -24" long than make 1 cut length wise up the side of the pipe. Cut 2 pcs. about 4-6" long. These will slid over the slit piece to hold it together. Then cut a piece of the 6" pipe the length you want and again cut a slit lengthwise. Make 2-3 4-6" pcs. of the 6" pipe to hold it together. Compress the long pipe and place the rings over it. Do the same with the long 6" pipe Pour the 8" piece and insert a piece of rebar in the center. When that is dry slide off the rings and remove the 8" pipe then compress the 6" pipe slide rings over it to hold and place over the rebar. When it is almost dry but still slightly wet remove rings and pipe and use either a piece of actual bark or a small stick to create the texture. If will be easier to remove the pipe if your spray them with Pam cooking spray on the inside. You can pm me for my phone number if this isn't clear. After the first one it'll only take 30 minutes or so to make anymore. Hope this helps.
Try www.cainz.co.jp I buy just about all my home DIY needs there when in Japan...
Understand the time factor. It really is pretty easy though.
Shipping concrete posts from Japan would cost a fortune- you could probably fly me out there to make 'em for you cheaper![]()