Yeah, MJconentrates listings aren't very clear about postage cost.
"Extras - U need 2 pay post too to 52 countries" - it is really weird phrasing, right? Is it confusing for native English speakers as well? For me it means - you need to pay postage for every extra, but it's not like that. You pay postage cost only once if they go in the same parcel.
Same as onthehunttopunt and carverr are advice is solid - ask for custom order if you want to order items from multiple listings, but if you don't want to wait and don't care much about BTC miner fees you can order it separately and pay by orders one by one.
I just wish they would offer special delivery by 1pm.