Sierra Trading Post has some 13x13 shelters on sale for $39.95 reg. $110. http://www.sierratradingpost.com/xq/asp/search_type.L2%7E318/dept_id.L2~318/size1./size2./gender.0/ShowImages.yes/sq.20/cont.1/header_title./special_type./sqlSearchStr./qx/prod_list_display.htm
Looks like an awful good price although they weigh 40#
Rod
PS. There is also a nice 10x18 that only weighs 22 lbs. It has a nice arched shape that would blend well with a TD. It's a little more expensive at $90. I've dealt with STP a number of times in the past & they are quite good. http://www.sierratradingpost.com/xq/asp/search_type.L2%7E318/dept_id.L2~318/size1./size2./gender.0/ShowImages.yes/sq.20/cont.1/header_title./special_type./sqlSearchStr./qx/prod_list_display.htm