Sorry, but no.
It is unlikely
The 3DS will likely not drop in price for at least a year. When it starts dropping will usually depend on if/when Nintendo decides to release an updated version of the system.
Nintendo dropped the price of the 3DS from $249.99 to $169.99, saying that poor sales in the system's first six months was the reason for the large drop. This change, in fact, happened to close to the 3DS launch that Nintendo is compensating people who bought it at $249.99 with the ambassador program.
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In USA, the price of PSP is about $240, and a Nintendo 3DS is about $249.99. In Japan, the price of PSP is about $200, and a Nintendo 3DS is about $194.99. In China, the price of PSP is about $150, and a Nintendo 3DS is about $160.
Dream Drop Distance is a 3DS game and DSi does not have the technology to run 3DS games.
Minecraft is not available for 3DS, so there is no price.
You can find the cheapest price for a Nintendo 3DS online. There are multiple websites that provide cheap and used Nintendo 3DS for a very affordable price. Check out those websites today.
Generally, 3DS games usually cost around $39.99 (CAD/USD) in North America
If you're interested in getting a Nintendo 3DS, it makes sense to try for the lowest price possible. Some retailers will offer discounts in order to encourage you to purchase your 3DS through them, while others will sell the unit at full price but offer discounts on game. Look for refurbished and used 3DS units to get an even lower Nintendo 3DS price, though make sure you get a warranty to protect your purchase.
One can find a Nintendo 3DS and a Nintendo 3DS bundle on Amazon. Amazon sells Nintendo 3DS and Nintendo 3DS bundles on their website at a reasonably low price.