Hobbyboss 1:48's are a good practice model for 28mm resin. They have hundreds of models but 95% are KV and Sherman variants. You can easily get a model for around £7 posted.
Not a great deal, about the same if a smidge less than the Tamiya fare. the KV series is good but the Sherman's are bit odd in proportions. Still, if you want to have a play with camo, flat and snow then the KV's are excellent buy for the money to earn skills on.