Until recently the Spark was available in 5 colors. More recently just 2.
it has been completely out of stock before but eventually returns. If you leave your email address at the purchase page you will be notified when again available.
if you’re trying to save money leave your address at DJI Refurbished site for “in-stock reminder”.
DJI has obviously cut down on production but they haven’t confirmed why. They are probably diverting resources to other models and/or prepping to replace the Spark (inevitable).