About tyres... Have a look what I found in me search for GREAT Serpent prices... Ellegi tyres, 10x 26mm for $52.35 and $61.76 for 30mm. Have a look at
http://www.rccarinternational.com and have a look in the shop, and it is under serpent... For me, this is an ok price... works out to like ~$6 a pair... And they ship anywhere in the world for a reasonable amount... not bad at all.