Advice wanted for pins available in March in WDW

Hello! We are taking a trip in March to WDW. I have usually only traded with cast members for hidden mickey pins in the past trips (has been 2 years now). I am now into collecting pins that include OE and LE. What sort of pins will be available at that time? I saw the new mystery set announced of sketched characters. I printed out a guide for pin boards and trading but is there any advice for buying pins? Such as what stores/locations would have more rare pins or are they all the same at all the parks/stores? I did check out the releasing pins on the WDW site for jan. and feb. and will be looking for the march pins. Also, how much do you spend when you go on new pins? thanks for any advice! Shelly

I am no expert but i will say my experience the past two years has been bleek...I dont get it. Disney pin traders in DTD has the case with the new releases including LE etc. but it seems the rack pins are the same all the time....Epcot past the Spaceship has pins and traders with books (shame DTD does not do that anymore) I am jealous of the trading that is going on in Disneyland---I will get there !!!! Alot of people swaer by the hotel lobbys

Thanks Dawny for your reply. I wondered if the pins you can buy are all the same everywhere. It is exciting to hear of the new sketch mystery pins. I assume they will be for sale throughout the parks? I guess I am just looking for any special tips if they are out there. I will check out the pins at DTD for the LE.
I want to trade some with the boards and cast members. Don't know if I will be brave enough for non-cast members. But if there are special pins then I want to buy them while I am there. Thanks for the advice! Shelly