here are the current prices of LE Pet Potions/Enchanted Plushies [[note - these are for plain coloures, non costumed pets]]:

Phanty - 140k
Poera - 165k
Huthiq - 400k
Zoink - 600K
Kronk - 650k
Oglue - 600k
Lati - 1.5mil
Quell - 2.8mil [[are retiring so price is constantly changing]]
Ercuw - 3mil
Chibs - 3mil [[are retiring so price is constantly changing]]
Sindi - 3.4mil
Mordo - 3.7mil
Viotto - 6mil
Yuni - 7mil
Rofling - 10mil

Many people, rather than saving this money for a LE Pet Potion/Enchanted Plushie, stat up Non-LE Pets to make them worth an LE. These are how many stats a Plain Costumed, Non-LE Pet needs to be statted by to be worth an LE:

Phanty - 6+
Poera - 7+
Huthiq - 10+
Zoink - 12+
Kronk - 15+
Oglue - 18+
Lati - 30+
Quell - 40+
Sindi - 45+
Ercuw - 45+
Mordo - 45+
Chibs - 50+
Viotto - 80+
Yuni - 100+
Rofling - 140+