Which countries provide visas at the Chinese border upon arrival? I've read that Laos at Mohan-Boten does. Are there any other places?
Yes, I have. I seems that Laos at Mohan-Boten will issue a visa upon arrival.
There's only three countries bordering Yunnan.
Foreigners are not allowed across the Myanmar land border anyway. That leaves Laos and Vietnam. Vietnam allows some foreigners in without visas for two weeks. You have to check the conditions for your nationality. Laos gives visas on arrival at the border for about 50 US dollars
Thank you for your help :-)