Haven't nearly finished my "due diligence" but Lewis and Lewis has an option for purchasing $500,000 "excess" liability coverage for $1.10 a day on a short-term policy and it appears their base policy is "combined single limit" (a phrase that I am admittedly not familiar with but that "suggests" to me $300K per person /$300K per accident but I will verify).
Right now, from the on-line sources, that appears to be the best coverage I can find. Full coverage including UIM on a bike less than $10K in value for 8 days coverage with $500K excess will be @ $108. In-line with Premium coverage at mexadventure with much lower limits and coverage ($111 with 100/300 and no UIM and $8K declared value).
Any Lewis and Lewis stories?