If they see, sure got tax. Try to smuggle into your luggage.

Bought my Tumbler from eBay. Confirmed is taxable, paid around USD$44 for the import charges alone 

Just completed this recently 

so far no gst. but if u super unlucky, then maybe kena import tax. its really up to ur luck and the custom officers. they will follow the local price (i believe they hv the list) if there's no receipt.

I buy and carry back sometimes. Recently bought from HK:
42038 artic truck @ HKD590 (~RM275) here selling RM380 ?
42039 race car @ HKD799 (~RM375) here selling RM430 ?

Other stuff I was searching in HK not really that cheap due to currency rate.

SG, pending carry back.
10242 mini cooper @ SGD129 (~RM347 according to current rate, but I'm holding SGD @ 2.55 previously = RM329) here selling RM400
42037 street motorcycle @ FREE    got it as a gift few months ago. Should be about SGD70-80

HKD I'm actually holding at 0.41 also, rather than 0.46-0.47 (above calculation)

Courier I use it to buy additional parts only. Not full boxes. So it depends on individual and the hassle of bringing it back.

Go get it (somewhere) bro    I was in HK last year when 10242 reached HK shore, but shop said is expensive at HKD1200 (~RM490 at that time) as it was courier-by-air into HK. He asked me to wait for courier-by-ship which will be 3 months later for the price to drop. So, if you like it, still can buy now.    HK is selling around HKD750 (~RM350) now, not cheap due to currency rate, unless have extra from when it was lower at 0.41. Therefore I bought at SG which is nearer and slightly cheaper.
I'm using big hardcase luggage about 28" can fit entire boxes this time, since I bought 2x average size boxes only. Also a big foldable bag to dump all my clothes for the return trip.
Otherwise, unbox and flatten it into luggage as well. Pack all sets into bags. Like this 

Comparison

Tumbler for 200 EU, equates to about 844 RM
Nice haul! Christmas must be early this year in Germany! 

retired set are hard to find now and very expensive..
most probably you can get via ebay or bricklink.com ..oversea..