yes, use an agent thou < recommend Cina travel on street 130 or Lucky Lucky motorcycle on Monivong as it saves the hassle of visiting the embassy 2x> $60
fly in get free 30 day visa exempt< travel to Cambodia VOA $30
return to Thailand receive another free 30 day visa exempt
You MIGHT be asked when boarding for ur flight to Thailand for a return or onward ticket so book ur ticket to Siem Rep for within 30 days of ur arrival in Thailand.
Getting a visa does NOT mean immigration will allow you in> If the officer sees consecutive tourist visas in a short time, he might refuse you or warn you NO MORE>
Tourist do not sign 6 month leases>
if ur staying 6 months get a Multiple entry tourist visa online