Originally Posted by MarcusT

Instead of the hassle of transporting a cheap bike. Purchase one in Germany. Decathlon (big box sports) has decent economical bikes and depending on the store, competent mechanics. Even the supermarkets have city bikes for as low as 99 euro, you'll need to do your own tweaking

There are also numerous rental options, I see you said it's too expensive, but I see rental prices as low as 10 euro a day.