If you can find them at MSRP, snap them up, but you should be prepared to pay a fair amount for each
When it comes to the eternal formats, sometimes the only way to get pimp versions of the playable cards (without spending a small fortune) is to go NFC
Since she's also a Merfolk, you can also give her a boost with all the different Merfolk lords across all three colors
To give a quick example, let's assume I wanted to find out a "fair" price for Vigor, I could look on its product page on magiccardmarket to see the following information (this is for the Lorwyn printing): You can see a number of prices, which I'll explain due to the lack of official documentation on the site: From gives you the cheapest price of availability of this card, with at least Excellent condition Foils from does the same, only counting Foils Price Trend is a fictional number, calculated from recent average selling prices per day the graph on the right illustrates recent prices and also shows the Price Trend, which is helpful to see recent developments - this will also let you gauge whether you can trust the previous figures Now, all of these values need to be taken with a grain of salt, as so far, this includes all sellers registered on the site