diff --git a/playbooks/deploy-aws.yaml b/playbooks/deploy-aws.yaml
index 4741fc5..84ce7f0 100644
--- a/playbooks/deploy-aws.yaml
+++ b/playbooks/deploy-aws.yaml
@@ -20,6 +20,7 @@
         "0": t4g.medium
         "1": c7g.medium
         "2": m6g.medium
+    aws_region: "{{ lookup('env', 'AWS_REGION') | default('us-west-2', true) }}"
 
   tasks:
     - set_fact:
@@ -104,6 +105,27 @@
             deploy_by_bib: "false"
       when: ami_id == ""
 
+    - name: "{{ random_instance_type }} is available in zone {{ aws_region }}a"
+      shell:
+        aws ec2 describe-instance-type-offerings \
+          --location-type availability-zone \
+          --filters "Name=instance-type,Values={{ random_instance_type }}" "Name=location,Values={{ aws_region }}a" \
+          --query "InstanceTypeOfferings"
+      register: result_instance_type_available
+
+    - name: "get available instance type in zone {{ aws_region }}a"
+      shell:
+        aws ec2 describe-instance-type-offerings \
+          --location-type availability-zone \
+          --filters "Name=instance-type,Values={{ instance_type[arch]["0"] }},{{ instance_type[arch]["1"] }},{{ instance_type[arch]["2"] }}" "Name=location,Values={{ aws_region }}a" \
+          --query "InstanceTypeOfferings" | jq -r '.[0].InstanceType'
+      register: result_instance_type
+      when: result_instance_type_available.stdout == '[]'
+
+    - set_fact:
+        random_instance_type: "{{ result_instance_type.stdout }}"
+      when: result_instance_type_available.stdout == '[]'
+
     - name: generate ec2_run_instance script
       template:
         src: ec2_run_instance.j2