celery seeds and celery salt – cash & carry or unimart, theres a repacker called Wilpack that carries these spices, sometimes they also have ground cardamom and possibly even mustard seeds because i know they have ground mustard
whole cardamom pods and mustard seeds – look for these in the indian grocers along UN Ave Manila, near unilevers HQ or if in makati in Taj along Bagtikan st, San Antonio Village
sweet paprika – in terrys selection either at the Podium or at the end of Pasong Tamo extension (look for pimenton dulce because theres another blend, the smoked pimenton)
the other ones are a bit more mainstream except for mace which I couldnt find in manila as well, just ended up not putting it
if all else fails, sometimes santis carries a seafood boil blend that might work as an old bay sub.

Copycat Old Bay Seasoning Blend

Ingredients:
1 tablespoon celery seeds
1 tablespoon whole black peppercorns
6 bay leaves
1/2 teaspoon whole cardamom pods
1/2 teaspoon mustard seeds
4 whole cloves
1 teaspoon sweet paprika
1/4 teaspoon mace

In a spice grinder or food processor, grind all ingredients until they are powdered. Store in a small glass jar for up to six months.

Copycat #2 Old Bay Seasoning

Ingredients:
1 tablespoon celery salt
2 teaspoons ground black pepper
1 tablespoon ground bay leaf
1/2 teaspoon ground cardamom
1/2 teaspoon dry mustard
1/4 teaspoon ground cloves
1 teaspoon paprika
1/4 teaspoon mace
1/4 teaspoon ground cinnamon

Combine, mixing well. Store in a cool place in an airtight jar.